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i <br /> BLAINE 1680 ROGERS AVENUE <br /> TECH SERVICES SAN JOSE,CALIFORNIA 95112 <br /> (408)573-7771 FAX <br /> �r n+rgo (408)573-0555 PHONE <br /> cl <br /> a ti' <br /> c <br /> Y <br /> March 30, 1998 <br /> Brett Hunter <br /> Chevron U.S.A. Products Company <br /> P.O. Box 6004 I <br /> San Ramon, CA 94583-0904 <br /> 1st Quarter 1998 Monitoring at 9-4054 <br /> First Quarter 1998 Groundwater Monitoring at <br /> Former Chevron Service Station Number 9-4054 <br /> 2103 Country Club Blvd. <br /> Stockton, CA <br /> Monitoring Performed on February 10, 1998 <br /> t <br /> a <br /> Groundwater Sampling Report 980210-D-1 <br /> I <br /> This report covers the routine monitoring of groundwater wells at this Chevron facility. Blaine <br /> Tech Services, Inc.'s work at the site includes inspection, gauging, evacuation, purgewater <br /> containment, sample collection and sample handling in accordance with standard procedures that <br /> conform to Regional Water Quality Control Board requirements. h <br /> �i <br /> Routine field data collection includes depth to water, total well depth, thickness of any separate <br /> immiscible layer, water column volume, calculated volume of a three-case volume purge, <br /> elapsed evacuation time, total volume of water removed, and standard water parameter <br /> instrument readings. Sample material is collected, contained, stored, and transported to the <br /> laboratory in conformance with EPA standards. Purgewater is, likewise, collected and <br /> transported to McKittrick Waste Treatment Site for disposal. <br /> Basic field information is presented alongside analytical values excerpted from the laboratory <br /> report in the cumulative table of WELL DATA AND ANALYTICAL RESULTS. The full <br /> analytical report for the most recent samples is located in the Analytical Appendix. The table <br /> also contains new groundwater elevation calculations taken from the computer plotted gradient <br /> map which is located in the Professional Engineering Appendix. <br /> i <br /> Blaine Tech Seivices,Inc. Report No. 980210-D-1 1st a-1998 Monitoring at Former Chevron 9-4054 <br />